--- a/svnqt/contextdata.cpp
+++ b/svnqt/contextdata.cpp
@@ -748,7 +748,7 @@
 
     svn_config_get(cfg, &mimetypes_file,
                    SVN_CONFIG_SECTION_MISCELLANY,
-                   SVN_CONFIG_OPTION_MIMETYPES_FILE, false);
+                   SVN_CONFIG_OPTION_MIMETYPES_FILE, NULL);
     if (mimetypes_file && *mimetypes_file) {
         if ((err = svn_io_parse_mimetypes_file(&(m_ctx->mimetypes_map),
              mimetypes_file, pool))) {